Lianja

SSH Public Key Authentication

Demonstrates authenticating with an SSH server using public-key authentication. A private key is loaded into an SshKey object and passed to AuthenticatePk. The matching public key must already be installed on the server for the account.

Note: The private-key path is relative to the application's current working directory. Supply the path to your own key file.

Background: Public-key authentication is the standard for unattended and automated SSH: the private key never leaves the client, the server merely trusts the corresponding public key, and no reusable password crosses the wire. SshKey imports several formats — OpenSSH PEM keys via FromOpenSshPrivateKey and PuTTY .ppk files via FromPuttyPrivateKey — encrypted or not. For an encrypted key, set the Password property before importing. Note that LoadText is only a convenience for reading a text file into a string; it does not itself load the key.

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llSuccess = .F.

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  Demonstrates authenticating with an SSH server using public-key authentication.  The matching
//  public key must already be installed on the SSH server for the account.

loSsh = createobject("CkSsh")

//  Timeouts, in milliseconds.
loSsh.ConnectTimeoutMs = 5000
loSsh.ReadTimeoutMs = 15000

lcHostname = "ssh.example.com"
lnPort = 22
llSuccess = loSsh.Connect(lcHostname,lnPort)
if (llSuccess = .F.) then
    ? loSsh.LastErrorText
    release loSsh
    return
endif

//  LoadText is a convenience method that reads any text file into a string.  It does not itself
//  load the key.
loKey = createobject("CkSshKey")
lcPrivKeyText = loKey.LoadText("qa_data/my_private_key.pem")
if (loKey.LastMethodSuccess = .F.) then
    ? loKey.LastErrorText
    release loSsh
    release loKey
    return
endif

//  Import the private key.  Both OpenSSH and PuTTY formats are supported, encrypted or not.
//  This example loads an unencrypted OpenSSH-format key; for a PuTTY .ppk file, call
//  FromPuttyPrivateKey instead.  For an encrypted key, set key.Password before importing.
llSuccess = loKey.FromOpenSshPrivateKey(lcPrivKeyText)
if (llSuccess = .F.) then
    ? loKey.LastErrorText
    release loSsh
    release loKey
    return
endif

llSuccess = loSsh.AuthenticatePk("mySshLogin",loKey)
if (llSuccess = .F.) then
    ? loSsh.LastErrorText
    release loSsh
    release loKey
    return
endif

? "Public-key authentication successful."

loSsh.Disconnect()


release loSsh
release loKey